不同植茶年限土壤团聚体有机碳的分布特征

doi:10.3864/j.issn.0578-1752.2013.09.010

Abstract

Abstract: 【Objective】The purpose of this study was to explore and learn about the soil organic carbon stability and carbon sequestration capacity.【Method】 Based on the method of field investigation and laboratory analysis, the distribution of organic carbon fractions in soil aggregates was studied under tea plantation of different ages.【Result】The content of total organic carbon (TOC), labile organic carbon (LOC), particulate organic carbon (POC), water soluble organic carbon (WSOC) and potential mineralized carbon (PMC) in soil aggregates comparatively increased as soil aggregates particles diameter reduced, the maximum value concentrated was found at ＜0.25 mm or 0.5-0.25 mm diameter. But the content of soil aggregates microbial biomass carbon(MBC) comparatively decreased when soil aggregates particles diameter reduced, the maximum value was found at 5-2 mm diameter. The proportion of organic carbon fractions to total organic carbon in soil aggregates decreased as soil aggregates particles diameter reduced. The content of TOC in soil aggregates increased when the age of tea plantation addition, the content of LOC and POC in soil aggregates first decreased and then increased as the age of tea plantation addition, the maximum value was found at tea plantation of 22 age. The content of WSOC, PMC and MBC in soil aggregates first increased and then decreased as the age of tea plantation increased, the maximum value was found at tea plantation of 30 age. The proportion of organic carbon fractions to total organic carbon in soil aggregates decreased as the increase of tea plantation age. The contents of TOC and organic carbon fractions in soil aggregates in 0-20 cm layer were greater than in 20-40 cm layer and the proportion of organic carbon fractions to total organic carbon in soil aggregates in 20-40 cm layer was greater than in 0-20 cm layer. 【Conclusion】 The stability of organic carbon was strong for the smaller particle size aggregates, and there was the critical age of plant tea for the soil organic carbon sequestration abilities. The carbon sink effect in 0-20 cm soil layer was stronger than that in 20-40 cm soil layer.

Key words: the age of tea plantation , soil aggregates , organic carbon fractions

ZHENG Zi-Cheng, LIU Min-Ying, LI Ting-Xuan. Distribution Characteristics of Organic Carbon Fractions in Soil Aggregates Under Tea Plantation of Different Ages[J].Scientia Agricultura Sinica, 2013, 46(9): 1827-1836.

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